What is the reaction involved in Holmes

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Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: P Block Elements

Question:

What is the reaction involved in Holmes signal?

Options:

Ca₃P₂ + 6H₂O → 2PH₃ + 3Ca(OH)₂

Ca₃P₂ + 6H₂O → 2PH₃ → P₂H₄ + P₄O₆ and CaC₂ + H₂O → C₂H₂

Ca₃P₂ + 6HCl → 2PH₃ + 3CaCl₂

P₄ + 3NaOH + 3H₂O → PH₃ + 3NaH₂PO₂

Correct Answer:

Ca₃P₂ + 6H₂O → 2PH₃ → P₂H₄ + P₄O₆ and CaC₂ + H₂O → C₂H₂

Explanation:

The reactions involved in Holmes signal are:

Ca₃P₂ + 6H₂O → 2PH₃ → P₂H₄ + P₄O₆ and CaC₂ + H₂O → C₂H₂

Calcium carbide and calcium phosphide both react with water to give acetylene and phosphine respectively. These gases burn to give the signal.